Ventilator.



No. 721,683. l PATENTED MAR. 3, 1903.

W. EDWARDS. VENTILATOR. APPLIQATION 11.51) MAR. 29, 1901. No MODEL.

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UNITED STATES PATENT OFFICE.

WALTER EDWARDS, OF MILFORD, ENGLAND.

VENTILATOR.

SPECIFICATION forming part of Letters Patent No. 721,683, dat-ed March 3, 1903.

Y Application iiled March 29, 1901. 'Serial No. 53,613.V (No model.)

Be it known that I, WALTER EDWARDS, builder, a subject ofthe King of Great Britain and Ireland, residing at Mousehill, Milford, in the county of Surrey, England, have invented certain new and useful Improvements iu Ventilators, of which the following is a specification.

This invention relates to improvements in ventilators adapted to'4 rooms or other interiors with a view to carrying ofbthe impure or vitiated air from the upper part of the same and preventing downdraft.

The ventilator is in the form of a box or case formed with passages or air-channels for the passage of the air and is fixed in an opening in the center ofthe ceiling. It is tted with pivoted flaps or valves of mica, which permit the passage of the air outward, but prevent downdraft. l

In the accompanying drawings, 'Figure l is a vertical section of the improved ventilator with the valves open. Fig. 2is a similar View showing the valves closed to prevent downdraft. Fig. 3 is an elevation of the upper part of the box with the outlet in section arranged in a horizontal instead of a vertical direction; and Fig. 4 is a sectional plan on the line x of Figs. 1 and 2, showing the valve-operating levers in full.

o. is the body or box, and b o are the passages or air-channels through which the air from the room passes by means of the lower opening c. f

d is the ilange for xingthe box to the ceiling by the screws, as shown', and e is a 'plate or deflector formed with a central opening e', arranged so as to cause the air-currents to take a zigzag course, as indicated by the arrows.

Above the deflector e is an inner chamber f, fitted with the valves or flaps g, covering the openings h, through which the air passes on its way to the outlet c', fitted with wirenetting 7c to keep out small animals and other objects. The outlet-pipe c' extends straight up through the roof when the apparatus is fitted to the top room of a house, but when fitted to lower rooms it may be carried along the ceiling-joists in a horizontal direction, as shown at t, Fig. 3, and out at the side walls. i

Z is a curved plate or cone for directing the incoming air directly onto the valves g to cause them to close the openings h and prevent such air from' entering the room. The valves stand normally in their open position, as shown in Fig. l; but whenit is desired to close them and stop the action of the ventilator the oval-shaped plate m is turned-by means of the knob or handle n into the position shown in Figs. 2 and 4:, which permits the pivoted weighted levers o to turn on their pivots, so as to closerthe valvesagainst the openings h, in which position they remain until the plate m is given a half-turn, when the levers o are forced into the position they occupy in Fig'. l, by reason of the rim 19 of 'the plate m bearing against their lower ends.

The valves are then free again to assume their open vertical position. The handle n is fitted with an index-plate to show the position of the said valves.

Having now fully described the nature of my said invention, what I claim, and desire to secure by Letters Patent, is-

In aventilator the combination of a box or case, such as a formed with slots or openings b on each side for the passage of air upward through a lower central opening c, .flanges CZ formed on the'lower edge of the box a for securing it by means of screws passing therethrough to a ceiling, a plate or deiiector e formed with an opening e' andY iixed above the central opening oso as to deiiect the air passing through the latterto the slots or openings ZJ, aninner chamber f, above the plate e into which the air from the box ct passes by means of side openings h formed therein, pivoted iiaps or valves g tted to said openings inside the chamberf for closing the same and preventing downdraft, an outlet z' at the top of said chamber fitted with wire-netting 7.o between it and the chamber, a curved plate or cone Z supported in the chambery for directing incoming air directly onto the valves g, an oval-shaped plate m carried in said chamber and turned by means ofk a-knob'n underneath the latter, pivoted weighted levers o inside the chamber acting-upon the valves g to close the same, and a ring p formed on the kplate m for holding the levers o out of contact with said valves, substantially as described.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

WALTER EDWARDS. Witnesses:

HARRY RAMBIRD, HORACE I-I. LUoAs.

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